(19)

(11)

EP 2 621 858 A2

(12)

(88) Date of publication A3: 07.06.2012 (43) Date of publication: 07.08.2013 Bulletin 2013/32 (21) Application number: 11829789.4 (22) Date of filing: 27.09.2011

(51) International Patent Classification (IPC):  C01F 7/02(2006.01) B01J 21/06(2006.01) C01G 23/00(2006.01) B01J 32/00(2006.01) (86) International application number: PCT/US2011/053339 (87) International publication number: WO 2012/044591 (05.04.2012 Gazette 2012/14)

(84) Designated Contracting States: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR (30) Priority: 01.10.2010 US 388764 P (71) Applicant: Saint-Gobain Ceramics and Plastics, Inc. Worcester, MA 01615-0138 (US)	(72) Inventors: HUGHES, Philip John Northallerton North Yorkshire DL6 2RQ (GB) SMITH, Rachel Louise Bourne Lincolnshire PE 10 9 PW (GB) (74) Representative: Zimmermann & Partner  Postfach 330 920 80069 München 80069 München (DE)